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the gold leaf will stray further away from the stationary rod
Square lenses are a magnifier that can be removed by unhooking from frame
Late 19th to early 20th century wooden Chinese Diptych
Excellent condition
and dyed bovine leather
Leslie's Differential Thermometer radio the gold leaf will strayPristine late 19th century Leslie's Differential Thermometer. Italian made, unsigned. Excellent condition, complete original. Originally invented by John Leslie in the early 1800's; Differential Thermometers are used to measure variations in temperature. This instrument works by adding a working liquid, such as Sulphuric acid to the 'wet bulb' (unnumbered side of U). Once the temperature rises, the pressure in the tube will push the liquid to the 'dry
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